Alaska ? Alaska’s Mount Redoubt continued to erupt Saturday, sending one ash plume 50,000 feet into the air.

The Alaska Volcano Observatory in Anchorage said the volcano had a significant eruption at 1:20 a.m. Saturday and a less powerful eruption at 2 p.m.

The ash is expected to move north toward the Alaska Range, missing Anchorage, which is about 100 miles from the volcano.

After the first eruption, the observatory detected strong seismic activity lasting 20 minutes or more followed by an hours-long low-level tremor.

“The vent has kind of opened up and there are gases and venting occurring. That is likely producing the tremor,” said Chris Waythomas, a geologist at the observatory.

“There is likely a lot of water vapor, which turns to ice which gives the plumes this whitish appearance, but there is still a lot of ash in there,” he said.